Size Chart

Black rubber O-Ring with round cord cross-section measured by digital calipers on a printed size chart

The Master O-Ring Size Chart: What It Shows, Why It Helps, and Who It Is For

A practical guide to the handbook Master O-Ring Size Chart: multi-standard sizing, nearest-match search, tolerances, back-up rings, and who gets the most from it.

AS568 O-Ring Size Chart (Dash Numbers)

AS568 O-Ring size chart with dash numbers, ID, CS, and OD in inches and millimeters for the 0xx through 4xx series, plus the history of the AS568 standard.

Backup Ring Size Chart (AS568)

AS568 back-up ring size chart with dash numbers, ID, width, height, and contour dimensions for high-pressure extrusion protection, plus how back-up rings fit the AS568 system.

BS 1806 O-Ring Size Chart

BS 1806 British imperial O-Ring size chart with dash numbers aligned to AS568-style series, plus background on BS 1806.

BS 4518 O-Ring Size Chart

BS 4518 British metric O-Ring size chart with ID, CS, and OD in millimeters and inches, plus background on the BS 4518 standard.

DIN 3771 O-Ring Size Chart

DIN 3771 German / EU metric O-Ring size chart with ID, CS, and OD in millimeters and inches, plus the history of DIN 3771.

Generic Metric O-Ring Size Chart

Generic metric O-Ring size chart of common tooling ID × CS sizes in millimeters, with OD and inch equivalents.

ISO 6149 O-Ring Size Chart (Metric Ports)

ISO 6149 metric port / fitting O-Ring size chart: port thread, CS×ID code, and ID/CS/OD in millimeters and inches.

JIS B 2401 O-Ring Size Chart (S / P / G / V)

JIS B 2401 Japanese O-Ring size chart: S, P, G, and V series with ID, CS, and OD in millimeters and inches, plus the history of the JIS B 2401 standard.

Master O-Ring Size Chart

Filterable multi-standard O-Ring size chart, search by ID or cross-section across AS568, ISO, JIS, BS, DIN and more.

Metric O-Ring Size Chart (ISO 3601)

Metric O-Ring size chart for ISO 3601: ID × CS in millimeters, store CS×ID codes, and OD, plus the history of the ISO 3601 standard.

NF T 47-501 O-Ring Size Chart

NF T 47-501 French metric O-Ring size chart with ID, CS, and OD in millimeters and inches.

ORB Boss O-Ring Size Chart (AS568 900-Series)

AS568 900-series ORB boss O-Ring size chart for SAE J1926 ports: dash, tube OD, thread, ID, CS, and OD, plus how boss seals fit the AS568 and J1926 story.

Parker 500 Series O-Ring Size Chart

Parker 500 series O-Ring size chart (5-xxx codes) with ID, CS, and OD in inches and millimeters.

SMS 1586 O-Ring Size Chart

SMS 1586 Swedish / Nordic metric O-Ring size chart with ID, CS, and OD in millimeters and inches.

Square Ring Size Chart (AS568 Dash)

Square ring size chart using AS568 dash numbers with ID, square-wall CS, and OD in inches and millimeters.

X-Ring Size Chart (AS568 Dash)

X-Ring (Quad-Ring) size chart using AS568 dash numbers with ID, CS, and OD in inches and millimeters.